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class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2020-08-17T10:00:37.000Z" title="发表于 2020-08-17 18:00:37">2020-08-17</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-01-10T12:28:26.330Z" title="更新于 2021-01-10 20:28:26">2021-01-10</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E5%89%8D%E7%AB%AF%E5%AD%A6%E4%B9%A0/">前端学习</a></span></div><div class="meta-secondline"> <span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">2.1k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>8分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="Vue知识点总结-一"><a href="#Vue知识点总结-一" class="headerlink" title="Vue知识点总结(一)"></a>Vue知识点总结(一)</h1><blockquote>
<p>纯属随笔记录，具体详细教程，请查阅<a target="_blank" rel="noopener" href="https://vuejs.bootcss.com/guide/">vue.js官网</a></p>
</blockquote>
<h2 id="一-Vue实现的MVVM模式"><a href="#一-Vue实现的MVVM模式" class="headerlink" title="一.Vue实现的MVVM模式"></a>一.Vue实现的MVVM模式</h2><p>   <img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200817/XgXgUxUmal7I.png" alt="MVVM模式结构"></p>
<ul>
<li><strong>MVVM分为三个部分：分别是M（Model，模型层 ），V（View，视图层），VM（ViewModel，V与M连接的桥梁，也可以看作为控制器）</strong></li>
</ul>
<ol>
<li>M：模型层，主要负责业务数据相关；</li>
<li>V：视图层，顾名思义，负责视图相关，简单来说就是HTML+CSS；</li>
<li>VM：V与M沟通的桥梁，负责监听M或者V的修改，是实现MVVM双向绑定的关键桥梁；</li>
</ol>
<ul>
<li><strong>MVVM实现双向绑定：即可以通过上面的视图来说，当V或者M层发生数据改变，这时VM层会及时检查到变化然后通知另一层也发生相应改变，这样使模块之间耦合度降低(强调的是UI中不包含业务逻辑的代码，即View和ViewModel解耦)</strong></li>
</ul>
<h2 id="二-el：挂载点"><a href="#二-el：挂载点" class="headerlink" title="二. el：挂载点"></a>二. el：挂载点</h2><blockquote>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">#HTML部分:</span><br><span class="line"></span><br><span class="line">&lt;div id=<span class="string">&quot;app&quot;</span>&gt;</span><br><span class="line">    &#123;&#123; message &#125;&#125;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line"></span><br><span class="line">#JavaScript部分:</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">      el: <span class="string">&#x27;#app&#x27;</span>,</span><br><span class="line">      data: &#123;</span><br><span class="line">        message: <span class="string">&#x27;Hello Vue!&#x27;</span></span><br><span class="line">      &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
</blockquote>
<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200817/bSpeRB61d3Bt.png" alt="效果图"></p>
<h4 id="注意点"><a href="#注意点" class="headerlink" title="注意点:"></a>注意点:</h4></li>
</ul>
<ol>
<li><h3 id="Vue实例的作用范围是什么呢"><a href="#Vue实例的作用范围是什么呢" class="headerlink" title="Vue实例的作用范围是什么呢?"></a>Vue实例的作用范围是什么呢?</h3><p>​    Vue会管理el选项<strong>命中的元素</strong>以及内部的<strong>后代元素</strong></p>
</li>
<li><h3 id="是否可以使用其他选择器"><a href="#是否可以使用其他选择器" class="headerlink" title="是否可以使用其他选择器"></a>是否可以使用其他选择器</h3><p>​    可以使用其他选择器比如: <code>el:&#39;.app&#39;</code>（class类选择器）或者<code>el:&#39;div&#39;</code>（标签）等，但是建议<strong>使用id选择器</strong>，因为id是唯一的。</p>
</li>
<li><h3 id="是否可以设置其他的DOM元素的呢"><a href="#是否可以设置其他的DOM元素的呢" class="headerlink" title="是否可以设置其他的DOM元素的呢?"></a>是否可以设置其他的DOM元素的呢?</h3><p>​    可以设置其他的双标签，但是<strong>不能设置<code>&lt;body&gt;</code>和<code>&lt;html&gt;</code>标签</strong></p>
</li>
</ol>
<hr>
<h2 id="三-data：数据对象"><a href="#三-data：数据对象" class="headerlink" title="三. data：数据对象"></a>三. data：数据对象</h2><blockquote>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">#HTML部分:</span><br><span class="line"></span><br><span class="line">&lt;div id=<span class="string">&quot;app&quot;</span>&gt;</span><br><span class="line">    &#123;&#123; message &#125;&#125;</span><br><span class="line">    &lt;p&gt;&#123;&#123;user&#125;&#125;&lt;/p&gt;</span><br><span class="line">    &lt;p&gt;&#123;&#123;user.name&#125;&#125;&lt;/p&gt;</span><br><span class="line">    &lt;li&gt;&#123;&#123;hobby[<span class="number">0</span>]&#125;&#125;&lt;/li&gt;</span><br><span class="line">    &lt;li&gt;&#123;&#123;hobby[<span class="number">2</span>]&#125;&#125;&lt;/li&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line"></span><br><span class="line">#JavaScript部分:</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">    el: <span class="string">&#x27;#app&#x27;</span>,</span><br><span class="line">    data: &#123;</span><br><span class="line">      message: <span class="string">&#x27;Hello Vue!&#x27;</span>,</span><br><span class="line">      user:&#123;</span><br><span class="line">        name:<span class="string">&#x27;张三&#x27;</span>,</span><br><span class="line">        age:<span class="number">18</span>,</span><br><span class="line">        sex:<span class="string">&#x27;男&#x27;</span></span><br><span class="line">      &#125;,</span><br><span class="line">      hobby:[<span class="string">&#x27;唱歌&#x27;</span>,<span class="string">&#x27;跳舞&#x27;</span>,<span class="string">&#x27;打篮球&#x27;</span>]</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
</blockquote>
<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200817/9MokX1TewF98.png" alt="效果图"></p>
<h4 id="注意点-1"><a href="#注意点-1" class="headerlink" title="注意点:"></a>注意点:</h4></li>
</ul>
<ol>
<li>Vue用到的数据定义在<strong>data</strong>中</li>
<li>data中可以写入<strong>复杂类型</strong>的数据</li>
<li>渲染复杂类型数据时，遵循<strong>js语法</strong>即可</li>
</ol>
<hr>
<h2 id="四-Vue指令"><a href="#四-Vue指令" class="headerlink" title="四. Vue指令"></a>四. Vue指令</h2><h3 id="1-v-text"><a href="#1-v-text" class="headerlink" title="1. v-text:"></a>1. v-text:</h3>   <figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"># HTML:</span><br><span class="line"></span><br><span class="line">&lt;div id=<span class="string">&quot;app&quot;</span>&gt;</span><br><span class="line">    &lt;h2 v-text = <span class="string">&quot;message&quot;</span>&gt;&lt;/h2&gt;</span><br><span class="line">    &lt;h2 v-text = <span class="string">&quot;user.name+&#x27;!&#x27;&quot;</span>&gt;&lt;/h2&gt;</span><br><span class="line">    &lt;h2 v-text = <span class="string">&quot;user.age&quot;</span>&gt;年龄:&lt;/h2&gt;</span><br><span class="line">    &lt;h2&gt;年龄:&#123;&#123;user.age&#125;&#125;&lt;/h2&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line"></span><br><span class="line"># JavaScript:</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">    el: <span class="string">&#x27;#app&#x27;</span>,</span><br><span class="line">    data: &#123;</span><br><span class="line">      message: <span class="string">&#x27;Hello Vue!&#x27;</span>,</span><br><span class="line">      user:&#123;</span><br><span class="line">        name:<span class="string">&#x27;张三&#x27;</span>,</span><br><span class="line">        age:<span class="number">18</span>,</span><br><span class="line">        sex:<span class="string">&#x27;男&#x27;</span></span><br><span class="line">     &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果</strong>:</p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200818/pQL4EJjXUc^H.png" alt="效果"></p>
</li>
<li><h4 id="注意点-2"><a href="#注意点-2" class="headerlink" title="注意点:"></a>注意点:</h4><ol>
<li><code>v-text</code>指令的作用是:设置标签的内容(textContent)</li>
<li>默认写法会替换全部内容，使用差值表达式(胡子语法)<code>&#123;&#123;&#125;&#125;`可以替换指定内容
     3. 如果想在`v-text`或者`&#123;&#123;&#125;&#125;</code>中拼接其他内容需要用单引号或者双引号取决于外层</li>
<li>内部支持写表达式</li>
</ol>
</li>
</ul>
<hr>
<h3 id="2-v-html"><a href="#2-v-html" class="headerlink" title="2. v-html:"></a>2. v-html:</h3>   <figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"># HTML:</span><br><span class="line"></span><br><span class="line">&lt;div id=<span class="string">&quot;app&quot;</span>&gt;</span><br><span class="line">    &lt;p v-html = <span class="string">&quot;message&quot;</span>&gt;&lt;/p&gt;</span><br><span class="line">    &lt;p v-text = <span class="string">&quot;message&quot;</span>&gt;&lt;/p&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line"></span><br><span class="line"># JavaScript:</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">    el: <span class="string">&#x27;#app&#x27;</span>,</span><br><span class="line">    data: &#123;</span><br><span class="line">      message: <span class="string">&#x27;&lt;a href = &quot;https://www.bilibili.com/&quot;&gt;哔哩哔哩&lt;/a&gt;&#x27;</span>,</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果</strong>:</p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200818/S1K3vo4zy3yw.png" alt="效果"></p>
</li>
<li><h4 id="注意点-3"><a href="#注意点-3" class="headerlink" title="注意点:"></a>注意点:</h4><ol>
<li><code>v-html</code>指令的作用是: 设置元素的<code>innerHTML</code></li>
<li>内容中有html结构会被解析为标签</li>
<li><code>v-text</code>指令无论内容是什么，只会解析为文本</li>
<li>解析文本使用v-text，需要解析html结构使用<code>v-html</code></li>
</ol>
</li>
</ul>
<hr>
<p>​    </p>
<h3 id="3-v-on"><a href="#3-v-on" class="headerlink" title="3.v-on:"></a>3.v-on:</h3><figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"># HTML:</span><br><span class="line"></span><br><span class="line">&lt;div id=<span class="string">&quot;app&quot;</span>&gt;</span><br><span class="line">    &lt;h2&gt;&#123;&#123;message&#125;&#125;&lt;/h2&gt;</span><br><span class="line">    &lt;button v-on:click = <span class="string">&quot;reduce&quot;</span>&gt;-&lt;/button&gt;</span><br><span class="line">    &lt;button @click = <span class="string">&quot;add&quot;</span>&gt;+&lt;/button&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line"></span><br><span class="line"># JavaScript:</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">    el: <span class="string">&#x27;#app&#x27;</span>,</span><br><span class="line">    data: &#123;</span><br><span class="line">      message: <span class="number">1</span></span><br><span class="line">    &#125;,</span><br><span class="line">    methods:&#123;</span><br><span class="line">      reduce()&#123;</span><br><span class="line">        <span class="built_in">this</span>.message--</span><br><span class="line">      &#125;,</span><br><span class="line">      add()&#123;</span><br><span class="line">        <span class="built_in">this</span>.message++</span><br><span class="line">     &#125;</span><br><span class="line">   &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<ul>
<li><p><strong>效果</strong>:</p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200818/uwqtaM8uTLuL.png" alt="原始效图"></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200818/RH914nSX!0Ur.png" alt="点击+号效果"></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200818/stc1s3xZZgGu.png" alt="点击-号的效果"></p>
</li>
<li><h4 id="注意点-4"><a href="#注意点-4" class="headerlink" title="注意点:"></a>注意点:</h4><ol>
<li><code>v-on</code>指令的作用是: 为元素绑定事件</li>
<li>事件名不需要写on</li>
<li>指令的语法糖(简写)是<code>@</code></li>
<li>绑定的方法写作<code>methods</code>属性中</li>
<li>方法内部通过<code>this</code>关键字可以访问定义在<code>data</code>中的数据</li>
<li>事件绑定的方法写成函数调用的形式，可以传入自定义参数</li>
<li>定义方法时需要定义形参接收传入实参</li>
<li>事件的后面跟上 <code>.修饰符</code>可以对事件进行限制</li>
<li><code>@keyup.enter</code>可以限制触发的按键为回车</li>
<li>修饰符有很多，详细参考<a target="_blank" rel="noopener" href="https://cn.vuejs.org/v2/api/#v-on">官方文档</a></li>
</ol>
</li>
</ul>
<hr>
<h3 id="4-v-show"><a href="#4-v-show" class="headerlink" title="4. v-show:"></a>4. v-show:</h3><figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"># HTML:</span><br><span class="line"></span><br><span class="line">&lt;div id=<span class="string">&quot;app&quot;</span>&gt;</span><br><span class="line">      &lt;h1 v-show=<span class="string">&quot;shut&quot;</span>&gt;哈哈哈&lt;/h1&gt;</span><br><span class="line">      &lt;button @click=<span class="string">&quot;show&quot;</span>&gt;显示&lt;/button&gt;</span><br><span class="line">      &lt;button @click=<span class="string">&quot;hide&quot;</span>&gt;隐藏&lt;/button&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line"></span><br><span class="line"># JavaScript:</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">      el: <span class="string">&quot;#app&quot;</span>,</span><br><span class="line">      data: &#123;</span><br><span class="line">        message: <span class="number">1</span>,</span><br><span class="line">        shut: <span class="literal">true</span>,</span><br><span class="line">      &#125;,</span><br><span class="line">      methods: &#123;</span><br><span class="line">        show() &#123;</span><br><span class="line">          <span class="built_in">this</span>.shut = <span class="literal">true</span>;</span><br><span class="line">        &#125;,</span><br><span class="line">        hide() &#123;</span><br><span class="line">          <span class="built_in">this</span>.shut = <span class="literal">false</span>;</span><br><span class="line">      &#125;,</span><br><span class="line">    &#125;,</span><br><span class="line">&#125;);</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200819/b5oD!bOOZvws.png" alt="默认效果"></p>
<p>​                                                                         <img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200819/1ru28iHaBlch.png" alt="点击隐藏效果"></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200819/c2AAsqqpT0P^.png" alt="点击显示后的"></p>
<ul>
<li><h4 id="注意点："><a href="#注意点：" class="headerlink" title="注意点："></a>注意点：</h4><ol>
<li><code>v-show</code>指令的作用是: 根据真假切换元素的显示状态</li>
<li>原理是修改元素的display，实现显示隐藏</li>
<li>指令后面的内容，最终都会解析为布尔值</li>
<li>值为true元素显示，值为false元素隐藏</li>
<li>数据改变后，对应的元素的显示状态会同步更新</li>
</ol>
</li>
</ul>
<hr>
</li>
</ul>
<h3 id="5-v-if-v-else"><a href="#5-v-if-v-else" class="headerlink" title="5. v-if,v-else:"></a>5. v-if,v-else:</h3>  <figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"># HTML:</span><br><span class="line"></span><br><span class="line">&lt;div id=<span class="string">&quot;app&quot;</span>&gt;</span><br><span class="line">      &lt;h1 v-<span class="keyword">if</span> = <span class="string">&quot;temperature &gt;= 30&quot;</span>&gt;热死了&lt;/h1&gt;</span><br><span class="line">      &lt;h1 v-<span class="keyword">else</span>&gt;舒服了&lt;/h1&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line"></span><br><span class="line"># JavaScript:</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">      el: <span class="string">&quot;#app&quot;</span>,</span><br><span class="line">      data: &#123;</span><br><span class="line">        temperature: <span class="number">32</span></span><br><span class="line">    &#125;,</span><br><span class="line">&#125;);</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200819/T1pJbUnRtOBP.png" alt="temperature大于等于30时效果"></p>
<p>​                                                                             <img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200819/nKh7EbMYVu40.png" alt="temperature小于30时效果"> </p>
</li>
<li><h4 id="注意点-5"><a href="#注意点-5" class="headerlink" title="注意点:"></a>注意点:</h4><ol>
<li><code>v-if</code>指令的作用是: 根据表达式的真假切换元素的显示状态</li>
<li>本质是通过操纵dom元素来切换显示状态</li>
<li>表达式的值为true，元素存在于dom树中，为false，从dom树中移除</li>
<li>频繁的切换用<code>v-show</code>，反之使用<code>v-if</code>，前者的切换消耗少</li>
</ol>
</li>
</ul>
<hr>
<h3 id="6-v-bind"><a href="#6-v-bind" class="headerlink" title="6. v-bind"></a>6. v-bind</h3>  <figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"># HTML</span><br><span class="line"></span><br><span class="line">&lt;div id=<span class="string">&quot;app&quot;</span>&gt;</span><br><span class="line">      &lt;img v-bind:src=<span class="string">&quot;imgURL&quot;</span> /&gt;</span><br><span class="line">      &lt;img :src=<span class="string">&quot;imgURL&quot;</span> :<span class="class"><span class="keyword">class</span></span>=<span class="string">&quot;&#123;active:shutActive&#125;&quot;</span> /&gt;</span><br><span class="line"> &lt;/div&gt;</span><br><span class="line"></span><br><span class="line"># class:</span><br><span class="line"></span><br><span class="line">.active &#123;</span><br><span class="line">        border: <span class="number">2</span>px solid red;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"># JavaScript:</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">      el: <span class="string">&quot;#app&quot;</span>,</span><br><span class="line">      data: &#123;</span><br><span class="line">        imgURL: <span class="string">&quot;http://qew58kkb2.hn-bkt.clouddn.com/cat.jpg&quot;</span>,</span><br><span class="line">        shutActive: <span class="literal">true</span>,</span><br><span class="line">     &#125;,</span><br><span class="line">&#125;);</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200819/xkkl963PRi*U.png" alt="效果图"></p>
</li>
<li><h4 id="注意点-6"><a href="#注意点-6" class="headerlink" title="注意点:"></a>注意点:</h4><ol>
<li><code>v-bind</code>指令的作用是: 为元素绑定属性</li>
<li>完整写法是: v-bind:属性名</li>
<li>语法糖(简写)的话可以直接省略v-bind，只保留 :属性名</li>
<li>需要动态的增删class建议使用对象的方式</li>
</ol>
</li>
</ul>
<hr>
<h4 id="7-v-for"><a href="#7-v-for" class="headerlink" title="7. v-for:"></a>7. v-for:</h4><figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"># HTML:</span><br><span class="line"></span><br><span class="line">&lt;div id=<span class="string">&quot;app&quot;</span>&gt;</span><br><span class="line">      &lt;ul v-<span class="keyword">for</span> = <span class="string">&quot;(item,index) in hobby&quot;</span>&gt;</span><br><span class="line">        &lt;li&gt;&#123;&#123;index+<span class="number">1</span>&#125;&#125;&#123;&#123;item&#125;&#125;&lt;/li&gt;</span><br><span class="line">      &lt;/ul&gt;</span><br><span class="line">      &lt;ul v-<span class="keyword">for</span> = <span class="string">&quot;item in user&quot;</span>&gt;</span><br><span class="line">        &lt;li&gt;&#123;&#123;item.name&#125;&#125;&lt;/li&gt;</span><br><span class="line">      &lt;/ul&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line"></span><br><span class="line"># JavaScript:</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">      el: <span class="string">&quot;#app&quot;</span>,</span><br><span class="line">      data: &#123;</span><br><span class="line">        hobby:[<span class="string">&#x27;唱歌&#x27;</span>,<span class="string">&#x27;跳舞&#x27;</span>,<span class="string">&#x27;打篮球&#x27;</span>,<span class="string">&#x27;打游戏&#x27;</span>,<span class="string">&#x27;看电视&#x27;</span>,<span class="string">&#x27;敲代码&#x27;</span>],</span><br><span class="line">        user:[</span><br><span class="line">          &#123;<span class="attr">name</span>:<span class="string">&#x27;法外狂徒张三&#x27;</span>&#125;,</span><br><span class="line">          &#123;<span class="attr">name</span>:<span class="string">&#x27;魔法少女赵四&#x27;</span>&#125;,</span><br><span class="line">          &#123;<span class="attr">name</span>:<span class="string">&#x27;铁血战士王五&#x27;</span>&#125;</span><br><span class="line">        ]</span><br><span class="line">     &#125;,</span><br><span class="line">  &#125;);</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200819/z4!e7CE4ZhzH.png" alt="效果图"></p>
</li>
<li><h4 id="注意点-7"><a href="#注意点-7" class="headerlink" title="注意点:"></a>注意点:</h4><ol>
<li><code>v-for</code>指令的作用是: 根据数据生成列表结构</li>
<li>数组经常和v-for结合使用</li>
<li>语法是<code>(item,index) in 数据</code></li>
<li>item 和 index 可以结合其他指令一起使用</li>
<li>数组长度的更新会同步到页面上，是响应式的</li>
<li>一定要配合<code>key</code>属性使用,属性值是唯一的就行，可以简单的这样理解：需要使用key来给每个节点做一个唯一标识，找到正确的位置区插入新的节点。<strong>key的作用主要是为了高效的更新虚拟DOM</strong></li>
</ol>
</li>
</ul>
<hr>
<h4 id="8-v-model"><a href="#8-v-model" class="headerlink" title="8. v-model:"></a>8. v-model:</h4><figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"># HTML:</span><br><span class="line"></span><br><span class="line">&lt;div id=<span class="string">&quot;app&quot;</span>&gt;</span><br><span class="line">      &lt;input type=<span class="string">&quot;text&quot;</span> v-model = <span class="string">&quot;message&quot;</span>&gt;</span><br><span class="line">      &lt;button @click = <span class="string">&quot;addText&quot;</span>&gt;补全&lt;/button&gt;</span><br><span class="line">      &lt;h1&gt;&#123;&#123;message&#125;&#125;&lt;/h1&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line"></span><br><span class="line"># JavaScript:</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">      el: <span class="string">&quot;#app&quot;</span>,</span><br><span class="line">      data: &#123;</span><br><span class="line">        message: <span class="string">&quot;学IT&quot;</span></span><br><span class="line">      &#125;,</span><br><span class="line">      methods:&#123;</span><br><span class="line">        addText()&#123;</span><br><span class="line">          <span class="built_in">this</span>.message = <span class="built_in">this</span>.message+<span class="string">&#x27;,来黑马程序&#x27;</span></span><br><span class="line">       &#125;</span><br><span class="line">   &#125;</span><br><span class="line">&#125;);</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200819/JXtCS^7LBkGS.png" alt="原效果"></p>
<p>​                                                        <img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200819/jkI5P@zQRzI9.png" alt="文本框里打字后的效果"> </p>
<p>​                                                        <img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200819/YDMc8m!rtLvc.png" alt="点击补全之后的效果"></p>
</li>
<li><h4 id="注意点-8"><a href="#注意点-8" class="headerlink" title="注意点:"></a>注意点:</h4><ol>
<li><code>v-model</code>指令的作用是便捷的设置和获取表单元素的值</li>
<li>绑定的数据会和表单元素值相关联</li>
<li>绑定的数据&lt;——&gt;表单元素的值</li>
</ol>
</li>
</ul>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">六根清静</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://liugenqingjing2.coding.me/2020/08/17/Vue%E7%9F%A5%E8%AF%86%E7%82%B9%E6%80%BB%E7%BB%93-%E4%B8%80/">https://liugenqingjing2.coding.me/2020/08/17/Vue知识点总结-一/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://liugenqingjing2.coding.me" target="_blank">小何blog (记录美好)</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/%E7%B3%BB%E5%88%97%F0%9F%8F%AC/">系列🏬</a><a 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100px;overflow: hidden;"><div id="history-card"></div></div></div></div><div class="card-widget card-announcement"><div class="card-content"><div class="item-headline"><i class="fas fa-bullhorn card-announcement-animation"></i><span>公告</span></div><div class="announcement_content">大学生一枚，软件工程，想做全栈攻城狮，哈哈，有兴趣可以加 QQ:484695754 (也可以点上面的logo)，一起交流学习</div></div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="card-content"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#Vue%E7%9F%A5%E8%AF%86%E7%82%B9%E6%80%BB%E7%BB%93-%E4%B8%80"><span class="toc-number">1.</span> <span class="toc-text">Vue知识点总结(一)</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%B8%80-Vue%E5%AE%9E%E7%8E%B0%E7%9A%84MVVM%E6%A8%A1%E5%BC%8F"><span class="toc-number">1.1.</span> <span class="toc-text">一.Vue实现的MVVM模式</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%BA%8C-el%EF%BC%9A%E6%8C%82%E8%BD%BD%E7%82%B9"><span class="toc-number">1.2.</span> <span class="toc-text">二. el：挂载点</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%B3%A8%E6%84%8F%E7%82%B9"><span class="toc-number">1.2.0.1.</span> <span class="toc-text">注意点:</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Vue%E5%AE%9E%E4%BE%8B%E7%9A%84%E4%BD%9C%E7%94%A8%E8%8C%83%E5%9B%B4%E6%98%AF%E4%BB%80%E4%B9%88%E5%91%A2"><span class="toc-number">1.2.1.</span> <span class="toc-text">Vue实例的作用范围是什么呢?</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%98%AF%E5%90%A6%E5%8F%AF%E4%BB%A5%E4%BD%BF%E7%94%A8%E5%85%B6%E4%BB%96%E9%80%89%E6%8B%A9%E5%99%A8"><span class="toc-number">1.2.2.</span> <span class="toc-text">是否可以使用其他选择器</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%98%AF%E5%90%A6%E5%8F%AF%E4%BB%A5%E8%AE%BE%E7%BD%AE%E5%85%B6%E4%BB%96%E7%9A%84DOM%E5%85%83%E7%B4%A0%E7%9A%84%E5%91%A2"><span class="toc-number">1.2.3.</span> <span class="toc-text">是否可以设置其他的DOM元素的呢?</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%B8%89-data%EF%BC%9A%E6%95%B0%E6%8D%AE%E5%AF%B9%E8%B1%A1"><span class="toc-number">1.3.</span> <span class="toc-text">三. data：数据对象</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%B3%A8%E6%84%8F%E7%82%B9-1"><span class="toc-number">1.3.0.1.</span> <span class="toc-text">注意点:</span></a></li></ol></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%9B%9B-Vue%E6%8C%87%E4%BB%A4"><span class="toc-number">1.4.</span> <span class="toc-text">四. Vue指令</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#1-v-text"><span class="toc-number">1.4.1.</span> <span class="toc-text">1. v-text:</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%B3%A8%E6%84%8F%E7%82%B9-2"><span class="toc-number">1.4.1.1.</span> <span class="toc-text">注意点:</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-v-html"><span class="toc-number">1.4.2.</span> <span class="toc-text">2. v-html:</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%B3%A8%E6%84%8F%E7%82%B9-3"><span class="toc-number">1.4.2.1.</span> <span class="toc-text">注意点:</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#3-v-on"><span class="toc-number">1.4.3.</span> <span class="toc-text">3.v-on:</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%B3%A8%E6%84%8F%E7%82%B9-4"><span class="toc-number">1.4.3.1.</span> <span class="toc-text">注意点:</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#4-v-show"><span class="toc-number">1.4.4.</span> <span class="toc-text">4. v-show:</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%B3%A8%E6%84%8F%E7%82%B9%EF%BC%9A"><span class="toc-number">1.4.4.1.</span> <span class="toc-text">注意点：</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#5-v-if-v-else"><span class="toc-number">1.4.5.</span> <span class="toc-text">5. v-if,v-else:</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%B3%A8%E6%84%8F%E7%82%B9-5"><span class="toc-number">1.4.5.1.</span> <span class="toc-text">注意点:</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#6-v-bind"><span class="toc-number">1.4.6.</span> <span class="toc-text">6. v-bind</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%B3%A8%E6%84%8F%E7%82%B9-6"><span class="toc-number">1.4.6.1.</span> <span class="toc-text">注意点:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#7-v-for"><span class="toc-number">1.4.6.2.</span> <span class="toc-text">7. v-for:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%B3%A8%E6%84%8F%E7%82%B9-7"><span class="toc-number">1.4.6.3.</span> <span class="toc-text">注意点:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#8-v-model"><span class="toc-number">1.4.6.4.</span> <span class="toc-text">8. v-model:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%B3%A8%E6%84%8F%E7%82%B9-8"><span class="toc-number">1.4.6.5.</span> <span class="toc-text">注意点:</span></a></li></ol></li></ol></li></ol></li></ol></div></div></div><div class="card-widget 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